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The Global Boundary Stratotype Section and Point (GSSP) for the Jurassic/Cretaceous boundary have not been decided yet.This is the last GSSP among the Phanerozoic system boundaries.Extensive researches have been performed in searching good candidates for the GSSP worldwide.The Jurassic/Cretaceous boundary in Japan was reviewed on the basis of radiolarian biostratigraphy (Matsuoka,1995).This paper reports recent progress in research on the Jurassic-Cretaceous boundary sequences in Japan.They have a potential in correlating non-marine sequences in East Asia including China,Korea,Russian Far East and so on because some of them are characterized by the alternation of terrestrial beds and ammonoid-bearing marine beds.